Posted by Janicholson on December 22, 2016 at 17:40:21 from (97.112.61.225):
In Reply to: Exploding Clutch posted by JimS on December 22, 2016 at 17:01:19:
There can be several "levels" of decomposition, some are just bad, some are deadly. Looking at least toxic, the most common (experience) is the failure of the friction material. It can come off of the rivets (or glue) and spray out into the housing. This leaves nothing to drive the disk, and the vehicle just doesn't move or slows to a stop. The splines driving the clutch shaft can also fail making noise but little forward progress. The springs in the hub, or the spring containment can fail letting the springs jam into the pressure plate this can cause the vehicle to keep driving making the only choice to be shutting it off, or moving the trans out of gear. The third possible failure involves the pressure plate or components of the plate. If the speeds are low (normal farm tractor) the failure is usually not a catastrophic event, but it can be really dangerous if running at high speeds in a puller, or a hotrod/race car. Failure can take the flywheel with it making a grenade out of the middle of the vehicle. A student in my AS Automotive program lost both feet when the clutch and flywheel exploded at about 7500rpm in a 57 Chevy drag car in 1970. He missed a shift into 2nd and the components blew the tunnel and dash through the windshield, and embedded flywheel parts into the pavement. His feet were forward of the clutch, and both were destroyed. Jim
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